Method of coating interior surfaces of hollow articles



10 October 13, 1931 to C. R. Moore, there is dis- After the interior surfaces of the parts'have 1 Patented rb.,14,1e3a p g 9 2,146,819

UNITED STATES PATENT orr cg ms'rnon or commie. m'rnmoa summons I or HOLLOW sanems Earl, C. Hall, Oak Park, Ill., assignor to Western Electric Company, Incorporated, New York,

N. Y., a corporation of New York No Drawing. Application April 23, 1937,

Serial No. 138.587

6 Claims. (CI. 91-68) This invention relates to a method of coating the tumbling barrel is approximately half filled interior surfaces of hollow articles, and more parwith the parts to be coated and when the quantvticularly to a method'of applying an abrasive ity of adhesive fluid employed is by volume apcoating to the interior surfaces of wire splicing proximately one-fifth of the parts to be coated. sleeves. Under these conditions, a tumbling period of ap- 5 An object of the invention is .to provide a proximatelyten minute's has been found suflisimple, inexpensive and efllcient method of coatcient, although this may be varied so long as ing interior surfaces of, hollow articles. it is sumcient to satisfactorily coat the interior In United States Patent No. 1,827,297, granted surfaces of the parts with the adhesive.

closed amethod of joining the-abutting ends of been satisfactorily coated with the adhesive, as wires in which the joint is formed by inserting above described, the surplus adhesive fluid is the ends of the wires into a metallic sleeve, the drained therefrom. This may be accomplished inner surface of which has been previously by placing the partsin aperforated basket. The coated with a fine abrasive material, such as partsare than tumbled with rags or other suitemery dust, after which the sleeve is forced into able material capable of removing and absorbing intimate contact with the wires, thus forming an the adhesive from the exterior surfaces of the exceedingly strong'and durable Joint. parts- A tumbling period of approximately five In accordance with one embodiment of the minutes has been found to be suflicient for this present invention, there is provided a simple and purpose. If desired, this tumbling operation may 20 inexpensive method of applying an abrasive coatbe done in the same tumbling barrel that is eming to the interior surfaces of wire splicing ployed for applying the adhesive coating, prosleeves of the type referred to. In pursuing this viding that the adhesive is first drained from the method, the sleeves are first tumbled with barrel. However, it has been found advantageous lacquer or other suitable adhesive to apply a to use a'separate barrel for each tumbling opera- 25 coating of the adhesive to the interior surfaces tion.

of the sleeves. The adhesiveis then removed After tumbling with rags until the exterior from the exterior surfaces of the sleeves by surfaces of the articles are substantially free of tumbling them with rags or other suitable adadhesive, the rags are removed from, the hesive absorbent material. While the abrasive tumbling barrel and while the adhesive coating 30 coating remaining on the interior surfaces of the remaining on the interior surfaces of the parts sleeves is still moist, the sleeves are then tumbled is still moist or tacky, the parts are tumbled in with a powdered abrasive, "such as emery dust, the presence of a powdered abrasive, such as whereby a coating of the abrasive is applied to about 200 mesh emery dust or the like. This 35.the adhesive coated interior surfaces of the tumbling operation is continued until a suitable sleeves, after which the sleeves-are again tumbled coating of the powdered abrasive is applied to with rags or other suitable material to remove the adhesive coating previously applied'to the the powdered abrasive from the exterior surfaces interior surfaces of the articles. A tumbling of the sleeves. period of approximately ten minutes has been 40 In practicing the embodiment of the invention found to be sufficient. for this purp se. The sur- 40 above referred to, a plurality of parts to be plus powdered abrasive isthen removed from the coated, such as wire. splicing sleeves, are first parts, for example, by shaking the parts. on a tumbled in a. suitable tumbling barrel in the screen, after. which the parts are again tumbled presence ofa suitable adhesive fluid, such as with rags to remove abrasive still adhering to lacquer. This tumbling operation is continued the exterior surfaces thereof. For this purpose, 45 until the interior surfaces of the parts are s'uba tumbling period of approximately five minutes stantially completely covered with the abrasive. has been found to be sumcient. The parts are 1 The number of parts which maybe so coated now ready for use and will be found to have interiorly' at one time may, of course, vary con-.- their interior surfaces substantially uniformly siderably so long as a satisfactory tumbling accoated with the powdered abrasive. 50 'tion is provided. Also, the quantity of adhesive It will be understood that the embodiments of fluid in the tumbling barrel may vary considerthe invention herein described are merely illusv ably. solong as it is-sumclent to completely coat trative and that the invention is not limited: the interior surfaces-of the sleeves. It has been thereto, except, as defined by the. appended found that satisfactory results are obtained when claims. I g '55 What is claimed is: Q

1. The method of applying an abrasive coating to the interior surfaces of wire splicing sleeves, which comprises tumbling the sleeves with lac- 'quer to apply a coating of lacquer to the interior tumbling the sleeves with rags to remove the exterior surfaces of the emery dust from the .sleeves.

2. The method of coating interior surfaces of hollow articles having openings to their interiors. which comprises tumbling the articles with a coating material, and then removing the coating material from the exterior surfaces of the articles-by tumbling the articles with an absorbent material which is of larger size than the openings in the articles and therefore incapable of entering the interiors of said articles.

3. The method of coating interior surfaces of hollow articles having openings to their interiors, which comprises tumbling the articles with an adhesive material, then tumbling the articles with a coating material and finally removing the adhesive and coating materials from the exterior surfaces only of the articles by tumbling the articles with an absorbent material which is larger than the openings in the articles and therefore incapable'of entering the interiors of said articles.

4. The method of coating interior surfaces of hollow articles having openings to their interiors, which comprises tumbling the articles in an adhesive fluid, then removing the adhesive from the exterior surfaces only of the articles by tumbling the articles with pieces of absorbent material too large to enter the interiors of the articles, then tumbling the articles with a coating material, and finally removing'the coating material from the exterior surfaces of the articles by again tumbling the articles with an absorbent material which is larger than the openings in the articles and therefore incapable of entering the interiors of said articles.

'5. Themethod of applying an abrasive coating to interior surfaces of hollow articles having opening to their interiors, which comprises tumbling the articles with an adhesive material, then removing the adhesive material from the exterior surfaces only of the articles'by tumbling the articles with an absorbent material which is larger than the interiors of the articles and therefore incapable of contacting the interior surfaces of the articles, and then tumbling the articles with abrasive particles.

6. The method of applying an abrasive coating to interior surfaces of hollow articles having openings to their interiors, which comprises tumbling the articles with an adhesive fluid, then removing the adhesive from the exterior surfaces of the articles by tumbling the articles with absorbent material which is larger than the in- 1 teriors of the articles and therefore incapable of contacting the interior surfaces of the articles, then tumbling the articles with a powdered abrasive, and finally removing the abrasive from the exterior surfaces of the articles by again tumbling the articles with the absorbent material.

EARLC. HALL. 

